Computer Networking
A protocol is a set of rules governing a time sequence of events that must take place

None of these
between peers
between an interface
between modems
across an interface

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Computer Networking
X.21 is

a method access control technique for multiple-access transmission media
a very common bit-oriented data link protocol issued by ISO
network access standard for connecting stations to a circuit-switched network
None of these
a method of determining which device has access to the transmission medium at any time

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Computer Networking
RS-449/442-A/423-A is

the ratio of the number of data units in error to the total number of data units
a check bit appended to an array of binary digits to make the sum of the all the binary digits
a set of physical layer standards developed by EIA and intended to replace RS-232-
None of these
a code in which each expression conforms to specific rules of construction, so that if certain errors occur in an expression the resulting expression will not conform to the rules of construction and

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